Improvement in stove-grates



J.M.THATOH ER.

STOVE GRATE Patented Dec. 6

@illt JOHN MERRITT THATGHER, OF BERGEN, NEW JERSEY.

Letters Patent No. 109,968, dated December 6,1870.

IMPROVEMENT lN STOVE-GRATES. 4

The Schedule referred to in these Letters Patent and making part of the same.

l, Jonx illnnnrr'r THA'IenJ-Jn, of Bergen, county of Hudson, State of New Jerrey, have invented an I :nprored Grate, of which the following is a specification.

Juturc and Object of the IIH'LNUOII.

My invention consists- First, of a concave-convex grate, adapted to astove or heater, and arranged to be turned within the same, as fully described hereafter;

Secondly, oifthc combination of the said grate with a movable or fixed outer grate; and

'lhirtlly, of such an arrangement of the said concave-convex grate, in respect to a movable outer grate, that both can be operated by a single crank or key, as hereafter explained.

Jlcscripiion of 11m Accompanying Drawing. Figure .l is a sectional view of my improved grate; Figure 2, a transverse section oi the same on the line 1 2, iig. 1, showing the central portion at the grate revc. ed or inverted; and

Figure 3, a plan view of fi 2.

General Description.

A represents part olthe outer casing otan upright.

cylindrical heating-stoic; and

B, an annular gllliU-llitll'tl', suitably secured within the same.

The grate consists of an annular portion, F, resting upon and arranged to'be turned to a limited extenton the bearer- 13, and ot' a central semi-spherical portion, 1, having trnunions, a. and a, adapted to projections or hearings, I) and 71, on the under side of the portion 1".

The central portion of the grate may he strengthened by a rod, f, extending across the same between the trunnions (r and u; but this is not essential.

In the enlarged outer end of the trunnion (a is formed asocket, 0, adapted to receive the squared end of a key, or key and crank, by which the whole grate may be reeiproeated upon the bearer or the central portion only be turned upon its trunnions.

' 'ihc annular portion 1! of the grate has radial bars Ir, which inclinedownward toward the. central portion (i, and the latter is also provided with radiating bars 'i, joined together at the center of the grate, where the re may he an opening, y. This arrangement of bars can, however, be mnditied, or the grate be merely punctured with holes; and, in some cases, the central .r'nllll-fillll 'gltl might be perfeetl y solid it" an outer grate of sullieieutly large area was employed.

When the. stove is in use the semi-spherical portion of the grate is retained in the upright position shown in fig. 1, so that it may project upward into the fire-place.

Tlre'grate may be held in this posit-ion by introducil@hc squared enlargement 0 into a similarly-shaped access of the casing of the stove, or any other suit-able retaining device may be employed.

In raking a store provided with an ordinary ilat grate, arranged to be reeiprocated or shaken upon an annular bearer or central pivot, the port-ion of the tire near the cireum fercnce of the grate, where the mot-ion is greatest, can he effectually cleared of ashes; but

is aptto be an accumulation of ashes, which interferes with tho draught and diminishes the supply of air. at the point where it is most needed.

The pecnliarprojeethig and upwardly-rounding form of the central portion of my improved grate eifectually prevents this accumulation of ashes at the center of the grate, and a more extended surface is also presented than in ordinary grates, so that a better and more thorough circulation of air through the spaces between the bars is insured.

\Vhen the whole grate is shaken or reciprocated upon the bearer 13, ashes, and particles of clinker, 850., too large to pass through the grate, will, -owing to the downward inclination toward each other of are bars 7: and i, be directed into the angle between the two portions of the grate, from which point they can be readily discharged into the receptacle beneath by slightly turning or swinging the central portion of the grate upon its trunnions;

When this accumulation is, however, considerable, or when it is necessary to remove all of the coal and ashes from the stove prior to lighting a, fresh lire, the central portion of the grate should first be turned then be again righted, in order to discharge the mass into the drawer beneath.

more expeditiously by turning the central portion of the grate continuously upon its trunnions some halt a dozen times or more. i 7

It is not absolutely necessary that the grate G should be of the semi-spherical form represented, as, for an oblong or flattened stove, it might be elongated upon one axis, providing only that its concave-convex form was retained, so that it might perform the doties above described.

at the center, where the motion is very slight, there half-way round, as shown in fig. 2, so as to form a concave receptacle into which the ashes will fall, and,

This may be repeated until the. lire-place is suin eiently cleared, or the same result maybe attained The outer grate F might also be stationary instead of movable, and could, in some cases, be dispensed With, and the grate G" be used independently.

I, therefore, claim- 1. The concave-convex grate G, adapted toe stove or heater, and arranged to be operated substantially in the manner described.

2. The said grate or semi-sphere G, in combination witha, morable o1 fixed outer grate, F.

3. The said grate G, s0 hung to a movable outer grate that both can be operated by a. single crank or key, substantially in the manner described.

In testimony whereof, I have signed my name to this specification inthe presence of two subscribing witnesses.

J. M. THATOHER.

Witnesses:

WM. A. STEEL, Fnlmnmx B. RIcnAnDs. 

